mirror of https://github.com/bjdgyc/anylink.git
135 lines
2.5 KiB
Go
135 lines
2.5 KiB
Go
package handler
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import (
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"net"
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"time"
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"github.com/bjdgyc/anylink/base"
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"github.com/bjdgyc/anylink/sessdata"
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)
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func LinkDtls(conn net.Conn, cSess *sessdata.ConnSession) {
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base.Debug("LinkDtls connect ip:", cSess.IpAddr, "udp-rip:", conn.RemoteAddr())
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dSess := cSess.NewDtlsConn()
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if dSess == nil {
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// 创建失败，直接关闭链接
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_ = conn.Close()
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return
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}
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defer func() {
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base.Debug("LinkDtls return", cSess.IpAddr)
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_ = conn.Close()
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dSess.Close()
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}()
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var (
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err error
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n int
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dead = time.Duration(cSess.CstpDpd+5) * time.Second
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)
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go dtlsWrite(conn, dSess, cSess)
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for {
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err = conn.SetReadDeadline(time.Now().Add(dead))
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if err != nil {
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base.Error("SetDeadline: ", err)
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return
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}
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pl := getPayload()
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n, err = conn.Read(pl.Data)
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if err != nil {
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base.Error("read hdata: ", err)
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return
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}
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// 限流设置
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err = cSess.RateLimit(n, true)
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if err != nil {
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base.Error(err)
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}
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switch pl.Data[0] {
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case 0x07: // KEEPALIVE
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// do nothing
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// base.Debug("recv keepalive", cSess.IpAddr)
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case 0x05: // DISCONNECT
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base.Debug("DISCONNECT DTLS", cSess.IpAddr)
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return
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case 0x03: // DPD-REQ
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// base.Debug("recv DPD-REQ", cSess.IpAddr)
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pl.PType = 0x04
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if payloadOutDtls(cSess, dSess, pl) {
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return
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}
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case 0x04:
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// base.Debug("recv DPD-RESP", cSess.IpAddr)
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case 0x00: // DATA
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// 去除数据头
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// copy(pl.Data, pl.Data[1:n])
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// 更新切片长度
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// pl.Data = pl.Data[:n-1]
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pl.Data = append(pl.Data[:0], pl.Data[1:n]...)
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if payloadIn(cSess, pl) {
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return
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}
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}
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}
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}
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func dtlsWrite(conn net.Conn, dSess *sessdata.DtlsSession, cSess *sessdata.ConnSession) {
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defer func() {
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base.Debug("dtlsWrite return", cSess.IpAddr)
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_ = conn.Close()
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dSess.Close()
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}()
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var (
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pl *sessdata.Payload
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)
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for {
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// dtls优先推送数据
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select {
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case pl = <-cSess.PayloadOutDtls:
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case <-dSess.CloseChan:
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return
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}
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if pl.LType != sessdata.LTypeIPData {
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continue
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}
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// header = []byte{payload.PType}
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if pl.PType == 0x00 { // data
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// 获取数据长度
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l := len(pl.Data)
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// 先扩容 +1
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pl.Data = pl.Data[:l+1]
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// 数据后移
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copy(pl.Data[1:], pl.Data)
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// 添加头信息
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pl.Data[0] = pl.PType
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} else {
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// 设置头类型
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pl.Data = append(pl.Data[:0], pl.PType)
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}
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n, err := conn.Write(pl.Data)
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if err != nil {
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base.Error("write err", err)
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return
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}
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putPayload(pl)
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// 限流设置
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err = cSess.RateLimit(n, false)
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if err != nil {
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base.Error(err)
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}
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}
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}
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